On the possibility of improving the oxidation resistance of high-chromium ferritic stainless steel using reactive element oxide nanoparticles

High-chromium ferritic steels are current the only viable candidates for cheap interconnect materials for application in high-temperature solid oxide fuel and electrolyzer cells (HT-SOFCs/SOECs). The durability and operating characteristics of interconnects manufactured using these materials may be improved significantly by applying a protective-conducting MoCo2O4 coating and depositing an intermediate layer consisting of nanoparticles of Gd2O3 – a reactive element oxide – on the surface of the steel substrate. The study demonstrated that the conditions of the thermal treatment of this layered system determine the efficacy of the applied modification with the reactive element. The persistence of this effect was tested over 7000 h of quasi-isothermal oxidation in air at 800°C.

高铬铁素体钢是当前用于高温固体氧化物燃料电池与电解池（HT-SOFCs/SOECs）的低成本互连材料的唯一可行候选材料。通过在钢基体表面涂覆兼具保护性与导电性能的MoCo₂O₄涂层，并沉积一层由活性元素氧化物氧化钆（Gd₂O₃）纳米颗粒构成的中间层，可显著提升采用此类材料制备的互连件的耐久性与运行特性。本研究表明，该多层体系的热处理工艺条件决定了活性元素改性方案的实施效果。针对该改性效果的持久性，我们在800℃空气中开展了长达7000小时的准等温氧化实验以完成验证。